Many thanks indeed Bill. I understand now what you're getting at with the
a/b-1!
Many thanks again.
Graeme Duncan
Bill.Venables wrote:
>
> The trick is to fit the model in a form which has the two separate
> intercepts and the two separate slopes as the parameters.
>
> You do have to realise
iginal Message-
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
On Behalf Of Greme
Sent: Wednesday, 13 February 2008 3:17 AM
To: r-help@r-project.org
Subject: [R] Finding LD50 from an interaction Generalised Linear model
Hi,
I have recently been attempting to find the LD50 from two predicted
Hi,
I have recently been attempting to find the LD50 from two predicted fits
(For male and females) in a Generalised linear model which models the effect
of both sex + logdose (and sex*logdose interaction) on proportion survival
(formula = y ~ ldose * sex, family = "binomial", data = dat (y is the
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